Electric heat radiator



ELECTRIC HEAT RADIATOR Filed June 10,, 3922 2 Sheets-Sheet l m 216 $2$02" Fm'iz Girazd A Hornqy 22 1925., mm m F. GERARD ELECTRIC HEATRADIATOR Filed Junw 10, 1922 2 Sheecs-Shee2 2 [n 276 72 Z02 fm'i'zfla'rard Patented Sept. I 22,

UNITED, STATES] PATENT OFFICE.

FRITZ eIRAnn, on HANAU-ION-THE'MAIN, GERMANY, ASSIGNOR TO THE FIRM,amaz- LAMPEN-GESELLSGHAFT MIT- BE GHRKNKTER HAFTUNG, 0F Iranian-cleans,-

MAIN, GERMANY.

' ELEcTnIc HEAT RADIATOR.

Application filed June 10,

To all whom it may concern: Be it know .that I, FRITZ GIRARD, a citi-Main, Germany, have invented certaih new and-useful Improvements inElectlric Heat fication.

My invention has reference to electric heat radiating andtransmittingpdevices, and it is particularly intended to provide/novelRadiators, of which the following is a. specimeans for the easyregulation and control of 3 devices of this kind and in general to soimprove and perfect the constru ct-ionand arrangement of the kinds ofapparatus of the class referredto that they may be safely applied to theskin or utilized for other purposes, where facility of-i'egulation ofthe heat, or easy applicability to a delicate obj ect is of importance.I A For the purposeof partial heating of rooms" 1 .electrical heatingdevices are-in use in which the heating body is arranged in the' focusof a parabolic mirror; and-by this means parallel heat rays are producedsimilar to the operation of optical. reflectors. Heat radiation of thiskind may also be employed for therapeutical purposes. These kinds ofapparatus of otherwise simple construction I are 'open' to thedilficultythat thereis no 1 way of limiting 'or of controlling the heat'radiation, as is frequently required for therapeutical purposes, andthat the intensity of the radiation of heat could only be regulatedheretofore by including a special kind of controlling or regulatingmeans in advance ofat'he radiator, such'as for instancea variableelectric resistance.

My lnvention 'is intended toeffect this regulation and control in anovel and efiicient manner, particularly by the provision of meansassociated With theretiQCtOr or mechanical parts of the heatnadiatmg'dewce.

' The invention is shown as embodied by way of example in aheatradiator-provided with the usual reflector in I Figure 1 in side viewwith parts in section. Figure 2 is an elevation o-fa portion of theouter end of the reflector ,in one of Various preferred-forms ofconstruction.

Figures}; and 4 illustraterespectively and in' a diagrammatic manner twodifferent forms of reflector as an illustration of one of the importantelements of my invention.

Figures 3' and 4 are diagrams illustrating 1922. 'Serial mi. 567,367

The parabolic mirror or reflector a .(Figmelt) is provided with asubstantially conical extension 6, the interior of which, in order toassist and increase the heat reflecting action, is provided with specialheat reflecting instrumentalities. Among other means I may make use inthe example shown 1n the drawlng of a coating of silver, nickel, or ofaluminium or the like upon the inner wallsof the conical extension, thesaid coating being preferably highly polished, so as to adapt the devicefor the substantially axialradiation ofthe rays of heat. emanatingfromthe source of heat mounted at 70 for instance.

Furthermore, the reflecting interior surface,

if the conical curvature is properly adjusted, causes a deflection ofall parallel rays which are not directly made to enter the end opening'of the extension, o as to direct them towards said aperture. Thus thefunnel shapedextension, as 'in the case of; rays of light, causes aconcentration of the heat rays over the-entire surface-oftheescapeopening. The path of the rays emitted by the heating body k will beapparent froieat the drawing, while the action of the h clearly shown inthe diagrams of Figures 3, 3' and 4, 4 respectively. to aThe-crowdingtogether of the heat rays correspondsto a change oftemperature at the funnel opening. )Nith the length of the funneltheescape opening is reduced, and

the more are the rays of heat proportionally concentrated? at theopening? Figures 3 y and 4' represent the temperatures obtained in thedifferent cases. In order to effect a regulation and control of thequantity of heat radiated per unit of irradiated surface authefunnelopening, and in order to increase that ratio, the funnel?) may,beconnected with a. second and third funnel 0 and d respectively,possessing the same degree of conical curvature as clearly shown inFigure 1 of the drawing. f i I Diaphragms are. provided for reducing thearea of the opening of the funnel.

form of diaphragm w ich I 'may employ for exam Is in connection with myinvention is shown in Figure 2 of the drawing. These diaphragms e aremounted at the end of the funnel, so as to 'be easily detachable.

The free opening of the diaphragm is sur rounded by a heat insulatingannulus or ring f of a noii-wnductor of heat, of .cork

or of a cork-composition for instance, which prevents convection of heattowards the protecting disc 9. The said protecting disc may itself heprovided with a. similar aunulus h made from a bad conductor of heat,which prevents burning of the skin, when the opening portion of thediaphragm "is brolight in contact with the living body.

' An additional regulation of-heat maybe effected by mounting aregulatable balance resistance coil in the supporting pillar of thereflecting device, such resistance being prothe almost completeutilization of the radiated heat which corresponds to a very greatreduction of the amount of watts required as compared with the kindsof'apparatus heretofore employed, and the possibility of producing agreat variation of the heat apphed to the living body .in a very simplea manner, by the u'se of funnel extensions of differentlength, as wellas by the use of diaphragms and by the possibility of a very convenientmanner of regulating the current. i

-While Lhave herein described my invention in its broad aspects, I wishit to understood that-it is obviously not restricted to the particularkinds ofembodiments as shown and 'described,.but changes and alterationsin'the structure and combination-of parts may occur to adapt the deviceto: varying conditions of use, and without deviating from the spiritofthe invention as expressed in the claims. I'claim: V

1. Heat radiator comprising in combination, a substantiallyfrusto-conical reflector,

a parabolic reflector covering ;the larger opening of saidfrusto-conical reflector and a source of heatin the focus of saidparabolic reflector.

2. Heat radiator comprising in combination, a plurality offrusto-conical reflectors disengageably assembled, the larger opening ofone adjoining the smaller opening of another reflector, a parabolicreflector covering the larger opening of the largestfrusto-eonicalreflector and a source of heat in the focus of saidparabolic reflector.

3. Heat radiator comprising in combination, a. parabolic reflector, asource of' heat in the focus of said reflector, an open-endedfrusto-conical reflectorassociated with said;

parabolic reflector in such manner that the totality of the heat raysemitted by said source, including those reflected by said parabolicreflector, is evenly distributed over the smaller opening of saidfrusto-conical reflector, and a diaphragm for reducing thecross-sectional area of the bundle of heat rays-removably attached tosaid smaller opening.

4. Heatradiator comprising in combination, a parabolic reflector, asource of heat in the focus'of said reflector, an open-endedfrusto-conical reflector associated with said parabolic reflector insuch manner that the totality of the heat rays emitted by said source,including those reflect-ed by said vparabolic reflector, is evenlydistributed over the smaller opening of said frustoconical reflector, adiaphragm for reducing the cross-sectional area of the bundle of heatrays removably attached to said smaller opening, and means associatedwith said dia phragm for preventing contact between it and the bodyexposed to the action of the heat rays. I

5. Heat reflector comprising in combinationi a parabolic reflector, asource of heat in the focus of said reflector, and open-endedfrusto-conical reflector associated with said parabolic reflector insuchmanner that the FRITZ GIRARD.

